ridiculous (adj.) Look up ridiculous at Dictionary.com
1540s, ridyculouse, from Latin ridiculosus "laughable," from ridiculus "that which excites laughter," from ridere "to laugh." Shakespeare and other 17c. writers sometimes spelled it rediculous. Slang extensions to "outrageous" (1839); "excellent" (1959, jazz slang). Related: Ridiculously; ridiculousness.